Blender Eevee lighting Rendering - Flashes of light in animation
I just ran into what may be the same issue rendering out some of my scenes with eevvee.  See screen shot.  I did a bit of investigation and where I have a stack of point lights in a complicated mesh every now and then I'll get that flash.  If I turned off bloom it stopped, looking at the rendered image it would have a few super white pixels for some reason that bloom was really blooming on causing the flashes.
I added a clamp value to the bloom (20 in my case worked) and it stops that happening.
To re-render the affected scenes without redoing the whole thing I tweaked my command line batch render as below just to re-render the affected frames.
&quot;--path to your blender install--\blender.exe&quot; -b  &quot;P.Scene4.Cut1.blend&quot; -f 2,5,36,51,52,53,70,75,77,78,104,105,114,119,137,149,169,174,186,221,232,233,241,246,247,250,252,259,266,276,277,280,283
Perhaps you issue is different but check bloom clamp, 0 is the default and that means no clamp at all.